ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Zoosystematics and Evolution Jahr/Year: 2019 Band/Volume: 95 Autor(en)/Author(s): Liu Mengmeng, Li Zejian, Wei Meicai Artikel/Article: Three new species of Macrophya Dahlbom (Hymenoptera, Tenthredinidae) with a key to species of the Macrophya imitator group in China 417- 427 Creative Commons Attribution 4.0 licence (CC-BY); original download https://pensoft.net/journals Zoosyst. Evol. 95 (2) 2019, 417–427 | DOI 10.3897/zse.95.35594 Three new species of Macrophya Dahlbom (Hymenoptera, Tenthredinidae) with a key to species of the Macrophya imitator group in China Mengmeng Liu1, Zejian Li1,2, Meicai Wei3 1 College of Ecology, Lishui University, Lishui, Zhejiang, China 2 Postdoctoral Work Station, Lishui Academy of Forestry, Lishui, Zhejiang, China 3 College of Life Science, Jiangxi Normal University, Nanchang, Jiangxi, China http://zoobank.org/7F0D0518-F845-43BB-924A-7B4AF0222126 Corresponding author: Meicai Wei ([email protected]); Zejian Li ([email protected]) Academic editor: Martin Husemann ♦ Received 20 April 2019 ♦ Accepted 10 July 2019 ♦ Published 25 July 2019 Abstract The Macrophya imitator group was proposed by Liu et al. in 2015. Three new species, Macrophya longlingensis sp. nov., M. niesh- uaiguoi sp. nov. and M. zejiani sp. nov. from China are described. A key to all Chinese species and a geographical distribution map of the M. imitator group in China are provided. Key Words Hymenoptera, Macrophya imitator group, Sawflies, taxonomy, Tenthredinoidea Introduction Macrophya Dahlbom, 1835 is the third largest genus in the constitute a clearly defined species group in Macrophya. subfamily Tenthredininae (Hymenoptera, Tenthredinidae). In this study, three new species belonging to this species It contains 306 species worldwide, of which 167 have been group are described from China, namely: M. longlingen- recorded for China up to April 2019 (Li et al. 2019a, 2019b; sis Li, Liu & Wei, sp. nov., M. nieshuaiguoi Li, Liu & Liu et al. 2019a, 2019b). The taxonomy and distribution of Wei, sp. nov. and M. zejiani Liu & Wei, sp. nov. A key to the genus in China has been studied by the last author and all species found in China is provided. his co-workers since 1994 and a division of Macrophya in species groups was given by Liu et al. (2015, 2018, 2019b). The Macrophya imitator group is the second largest Materials and methods species group in Macrophya, with 17 species worldwide, all of which are present in China. Among them, M. imita- All specimens of the newly described species were ob- tor Takeuchi is also distributed in Japan, Korea and Rus- tained by sweeping in wooded bog and forest fringe sia (Takeuchi 1937), and M. postscutellaris Malaise in zones in Yunnan Province (southern China) from 1994 Myanmar (Malaise 1945). The species of the Macrophya to present. Eight specimens of three new species and 788 imitator group are all similar in general morphology and specimens of known species were examined and studied Copyright Mengmeng Liu et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Creative Commons Attribution 4.0 licence (CC-BY); original download https://pensoft.net/journals 418 Mengmeng Liu et al.: Three new species of Macrophya imitator group for this work. The specimens were examined with a Mot- diagnosis to which was provided by Li et al. (2019b). ic-SMZ-171 stereomicroscope. Images of the imagines Species of the M. imitator group can be recognized us- were taken with a Nikon D700 digital camera and a Lei- ing the diagnosis provided by Liu et al. (2015), here ca Z16APO. The genitalia were examined with a Motic restated: the body mainly black, without metallic tinge; BA410E microscope and photographed with Motic Moti- the antenna slender and black; the posterior margin of cam Pro 285A. Images were focus-stacked using Helicon metepimeron straight or slightly concave, the append- Focus (HeliconSoft, Kharkiv, Ukraine) and further pro- age (= posterior corner of metepimeron) differentiated cessed with Adobe Photoshop CS 11.0. but not elongated, at least partly punctate and even- The terminology of genitalia follows Ross (1945) and ly pilose, without basin; the abdominal tergum 1 not that of general morphology follows Viitasaari (2002). For reticulate and the penis valve oval, narrowed toward a few terms (e.g. middle fovea and lateral fovea), we fol- apex, ergot short. low Takeuchi (1952). Description. Body slender and mainly black, with- All types are deposited in the Insect Collection of Cen- out metallic tinge; white maculae to varying extents on tral South University of Forestry and Technology, Chang- pronotum, hind trochanter and dorsal surface of hind sha, Hunan, China (CSCS). tibia subapically; fore wing without smoky macula be- low pterostigma; clypeus at its greatest breadth slightly Abbreviations: broader than the shortest distance between lower inner orbits of eyes; lateral margins convergent anteriorly, an- OCL The distance between a lateral ocellus and the terior margin incised to approximately 1/5–1/3 length occipital carina, or the hind margin of the head of clypeus, apex of lateral lobe obtuse; malar space where this carina would be if it were developed narrower than diameter of an ocellus; postocellar area (Benson 1954). broader than long; vertex with minute and dense punc- OOL The shortest distance between an eye and a later- tures, interspaces between punctures narrow usually; al ocellus. antenna slender and black, antennomere 3 clearly longer POL The distance between the mesal margins of the than antennomere 4; posterior margin of metepimeron two lateral ocelli. straight or slightly concave, appendage (posterior cor- ner of metepimeron) differentiated but not elongated, at least partly punctate and evenly pilose, without basin; Results inner spur of hind leg slightly longer than half length of metabasitarsus, metabasitarsus always slender, slightly Macrophya imitator species group longer than following four tarsomeres together; claw with inner tooth slightly shorter than outer tooth; ab- Remarks. The Macrophya imitator group is morpho- dominal tergum 1 not reticulate; penis valve oval, nar- logically very similar to the M. maculitibia group, a rowed towards apex, ergot short. Key to the Chinese species of the Macrophya imitator group 1 Female ...................................................................................................................................................................... 2 – Male ....................................................................................................................................................................... 21 2 Ovipositor sheath much longer than middle tibia ....................................................................................................... 3 – Ovipositor sheath clearly shorter than middle tibia .................................................................................................... 5 3 Posterior margin of pronotum with narrow white band; dorsal surface of hind tibia with a large white macula subapically. China (Beijing, Gansu, Hebei, Henan, Hubei, Ningxia, Qinghai, Shaanxi, Shanxi, Sichuan) ................. M. weni Wei, 1998 – Pronotum entirely black; dorsal surface of hind tibia with a subapical white macula smaller than above ..................... 4 4 Postocellar area 2.5× broader than long; POL: OOL: OCL = 4.5: 10: 5.5 (Figure 3B); antennomere 3 approximately 1.4× longer than antennomere 4 (13: 9) (Figure 3D); distance between cenchri twice breadth of a cenchrus; middle serrulae with 2 or 3 proximal and 9 or 10 distal teeth (Figure 3H); cell 2Rs as long as cell 1R1, petiole of anal cell in hind wing 0.6× as long as cross-vein cu-a (Figure 3A). China (Yunnan) ............................................... M. zejiani Liu & Wei, sp. nov. – Postocellar area twice broader than long; POL: OOL: OCL = 3: 10: 7; antennomere 3 approximately 1.8× longer than antennomere 4 (11: 6); distance between cenchri 2.5× breadth of a cenchrus; middle serrulae with 2 proximal and 9–12 distal teeth; cell 2Rs clearly shorter than cell 1R1, petiole of anal cell in hind wing only slightly shorter than cross-vein cu-a. China (Sichuan) .............................................................................................M. omeialpina Li, Jiang & Wei, 2018 5 Apex of middle tibia with a distinct white macula on dorsal surface; punctures on middle part of mesepisternum minute, much smaller than punctures on vertex ..................................................................................................................... 6 – Apex of middle tibia without white macula on dorsal surface, but sometimes with a white spot or stripe on anterior surface; punctures on middle part of mesepisternum about as large as or somewhat smaller than punctures on vertex .............12 6 Hind trochanter entirely white .................................................................................................................................... 7 – Hind trochanter partly white, with a distinct black macula ......................................................................................... 8 zse.pensoft.net Creative Commons Attribution 4.0 licence (CC-BY); original download